Download the patch here and put the files in the game directory as shown in the description. Your game will show (and run) the correct version then.
But be aware that the compressed version is unsupported. Always use the full version of the game (it really doesn't pay off trying to save a few GB of download every few months).
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However, the changelog doesn't say anythjing about this opportunity, so I doubt that it will make a difference if you are using 05 or 06.
Did you follow the tip you got ealier? The whole opportunity is about getting caught in the bathroom again and again and again.
The hint about the sweets only tells you that you can improve her mood this way. It dose NOT say that you will continue the opportunity by giving her sweets.